I'm only on my 4th tank of gas having bought the car 8/16/13 (wow actually two months to the date!), but I too have experienced this.
Learn by doing right?
Usually 5-6+ miles after three dots remain, the 'estimated range' alert comes on. I've let it go to dashes, then filled up only 16.7 gallons, so I was taken back a bit by that for a 19gallon tank.
The lesson here is, there is simply no accuracy to the range, and I've settled for a minimum of 3 dots since I don't like looking at the alert message.
Yes in case you were wondering, do the the proximity of work & gas/grocery stores, I usually fill up only twice a month.
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